forked from osmocom/wireshark
![Jeff Morriss](/assets/img/avatar_default.png)
- s/ntohl/g_ntohl - s/free/g_free - Change some tvb_get_string()+g_free()'s into tvb_get_ephemeral_string() - Change some tvb_fake_unicode()+g_free()'s into tvb_get_ephemeral_faked_unicode() - Change some tvb_get_string() calls that were clearly memory leaks (like atoi(tvb_get_string(...))) into tvb_get_ephemeral_string() svn path=/trunk/; revision=22515
917 lines
30 KiB
C
917 lines
30 KiB
C
/* packet-bittorrent.c
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* Routines for bittorrent packet dissection
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* Copyright (C) 2004 Jelmer Vernooij <jelmer@samba.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-pop.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/prefs.h>
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#include <epan/conversation.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include <epan/emem.h>
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#include "packet-tcp.h"
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/*
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* See
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*
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* http://bittorrent.com/protocol.html
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* http://wiki.theory.org/BitTorrentSpecification
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* http://bitconjurer.org/BitTorrent/protocol.html
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*/
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#define BITTORRENT_MESSAGE_CHOKE 0
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#define BITTORRENT_MESSAGE_UNCHOKE 1
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#define BITTORRENT_MESSAGE_INTERESTED 2
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#define BITTORRENT_MESSAGE_NOT_INTERESTED 3
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#define BITTORRENT_MESSAGE_HAVE 4
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#define BITTORRENT_MESSAGE_BITFIELD 5
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#define BITTORRENT_MESSAGE_REQUEST 6
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#define BITTORRENT_MESSAGE_PIECE 7
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#define BITTORRENT_MESSAGE_CANCEL 8
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#define BITTORRENT_HEADER_LENGTH 4
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/*
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* Azureus messages are specified by name so these are made up numbers
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* for internal identification only.
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*
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* Standard BT message types are a single byte, so these won't clash
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*/
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#define AZUREUS_MESSAGE_HANDSHAKE 256
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#define AZUREUS_MESSAGE_KEEP_ALIVE 257
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#define AZUREUS_MESSAGE_BT_HANDSHAKE 258
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#define AZUREUS_MESSAGE_PEER_EXCHANGE 259
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#define AZUREUS_MESSAGE_JPC_HELLO 260
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#define AZUREUS_MESSAGE_JPC_REPLY 261
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static const value_string bittorrent_messages[] = {
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{ BITTORRENT_MESSAGE_CHOKE, "Choke" },
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{ BITTORRENT_MESSAGE_UNCHOKE, "Unchoke" },
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{ BITTORRENT_MESSAGE_INTERESTED, "Interested" },
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{ BITTORRENT_MESSAGE_NOT_INTERESTED, "Not Interested" },
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{ BITTORRENT_MESSAGE_HAVE, "Have" },
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{ BITTORRENT_MESSAGE_BITFIELD, "Bitfield" },
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{ BITTORRENT_MESSAGE_REQUEST, "Request" },
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{ BITTORRENT_MESSAGE_PIECE, "Piece" },
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{ BITTORRENT_MESSAGE_CANCEL, "Cancel" },
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{ AZUREUS_MESSAGE_KEEP_ALIVE, "Keepalive" },
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{ AZUREUS_MESSAGE_HANDSHAKE, "Azureus Handshake" },
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{ AZUREUS_MESSAGE_BT_HANDSHAKE, "Azureus BitTorrent Handshake" },
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{ AZUREUS_MESSAGE_PEER_EXCHANGE, "Azureus Peer Exchange" },
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{ AZUREUS_MESSAGE_JPC_HELLO, "Azureus PeerCache Hello" },
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{ AZUREUS_MESSAGE_JPC_REPLY, "Azureus PeerCache Reply" },
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{ 0, NULL }
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};
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static const value_string azureus_priorities[] = {
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{ 0, "Low" },
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{ 1, "Normal" },
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{ 2, "High" },
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{ 0, NULL }
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};
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struct amp_message {
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const char *name;
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guint32 value;
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};
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static const struct amp_message amp_messages[] = {
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{ "BT_KEEP_ALIVE", AZUREUS_MESSAGE_KEEP_ALIVE },
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{ "BT_CHOKE", BITTORRENT_MESSAGE_CHOKE },
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{ "BT_UNCHOKE", BITTORRENT_MESSAGE_UNCHOKE },
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{ "BT_INTERESTED", BITTORRENT_MESSAGE_INTERESTED },
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{ "BT_UNINTERESTED", BITTORRENT_MESSAGE_NOT_INTERESTED },
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{ "BT_HAVE", BITTORRENT_MESSAGE_HAVE },
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{ "BT_BITFIELD", BITTORRENT_MESSAGE_BITFIELD },
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{ "BT_REQUEST", BITTORRENT_MESSAGE_REQUEST },
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{ "BT_PIECE", BITTORRENT_MESSAGE_PIECE },
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{ "BT_CANCEL", BITTORRENT_MESSAGE_CANCEL },
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{ "AZ_HANDSHAKE", AZUREUS_MESSAGE_HANDSHAKE },
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{ "BT_HANDSHAKE", AZUREUS_MESSAGE_BT_HANDSHAKE },
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{ "AZ_PEER_EXCHANGE", AZUREUS_MESSAGE_PEER_EXCHANGE },
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{ "JPC_HELLO", AZUREUS_MESSAGE_JPC_HELLO },
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{ "JPC_REPLY", AZUREUS_MESSAGE_JPC_REPLY },
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{ NULL, 0 }
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};
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static dissector_handle_t dissector_handle;
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static int proto_bittorrent = -1;
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static gint hf_bittorrent_field_length = -1;
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static gint hf_bittorrent_prot_name_len = -1;
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static gint hf_bittorrent_prot_name = -1;
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static gint hf_bittorrent_reserved = -1;
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static gint hf_bittorrent_sha1_hash = -1;
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static gint hf_bittorrent_peer_id = -1;
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static gint hf_bittorrent_msg = -1;
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static gint hf_bittorrent_msg_len = -1;
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static gint hf_bittorrent_msg_type = -1;
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static gint hf_azureus_msg = -1;
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static gint hf_azureus_msg_type_len = -1;
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static gint hf_azureus_msg_type = -1;
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static gint hf_azureus_msg_prio = -1;
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static gint hf_bittorrent_bitfield_data = -1;
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static gint hf_bittorrent_piece_index = -1;
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static gint hf_bittorrent_piece_begin = -1;
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static gint hf_bittorrent_piece_length = -1;
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static gint hf_bittorrent_piece_data = -1;
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static gint hf_bittorrent_bstr_length = -1;
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static gint hf_bittorrent_bstr = -1;
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static gint hf_bittorrent_bint = -1;
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static gint hf_bittorrent_bdict = -1;
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static gint hf_bittorrent_bdict_entry = -1;
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static gint hf_bittorrent_blist = -1;
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static gint hf_azureus_jpc_addrlen = -1;
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static gint hf_azureus_jpc_addr = -1;
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static gint hf_azureus_jpc_port = -1;
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static gint hf_azureus_jpc_session = -1;
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static gint ett_bittorrent = -1;
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static gint ett_bittorrent_msg = -1;
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static gint ett_peer_id = -1;
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static gint ett_bittorrent_bdict = -1;
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static gint ett_bittorrent_bdict_entry = -1;
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static gint ett_bittorrent_blist = -1;
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static gboolean bittorrent_desegment = TRUE;
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static gboolean decode_client_information = FALSE;
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struct client_information {
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char id[4];
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const char *name;
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};
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static struct client_information peer_id[] = {
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{"-AZ", "Azureus"},
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{"-BB", "BitBuddy"},
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{"-CT", "CTorrent"},
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{"-MT", "MoonlightTorrent"},
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{"-LT", "libtorrent"},
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{"-BX", "Bittorrent X"},
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{"-TS", "Torrentstorm"},
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{"-TN", "TorrnetDotNET"},
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{"-SS", "SwarmScope"},
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{"-XT", "XanTorrent"},
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{"-BS", "BTSlave"},
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{"-ZT", "ZipTorrent"},
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{"S", "Shadow's client"},
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{"U", "UPnP NAT Bit Torrent"},
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{"T", "BitTornado"},
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{"A", "ABC"},
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{"", NULL}
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};
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static guint get_bittorrent_pdu_length(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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guint8 type;
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guint32 length;
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if (tvb_get_guint8(tvb, offset) == 19 &&
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tvb_memeql(tvb, offset + 1, "BitTorrent protocol", 19) == 0) {
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/* Return the length of a Handshake message */
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return 1 + /* pstrlen */
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19 + /* pstr */
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8 + /* reserved */
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20 + /* SHA1 hash of the info key */
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20; /* peer id */
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} else {
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/* Try to validate the length of the message indicated by the header. */
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length = tvb_get_ntohl(tvb, offset);
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if(length == 0) {
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/* keep-alive - no message ID */
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return BITTORRENT_HEADER_LENGTH;
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}
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/* Do some sanity checking of the message, if we have the ID byte */
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if(tvb_offset_exists(tvb, offset + BITTORRENT_HEADER_LENGTH)) {
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type = tvb_get_guint8(tvb, offset + BITTORRENT_HEADER_LENGTH);
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if(type <= BITTORRENT_MESSAGE_CANCEL && length<0x1000000) {
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/* This seems to be a valid BitTorrent header with a known
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type identifier */
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return BITTORRENT_HEADER_LENGTH + length;
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} else {
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/* The type is not known, so this message cannot be decoded
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properly by this dissector. We assume it's continuation
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data from the middle of a message, and just return the
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remaining length in the tvbuff so the rest of the tvbuff
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is displayed as continuation data. */
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return tvb_length_remaining(tvb, offset);
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}
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} else {
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/* We don't have the type field, so we can't determine
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whether this is a valid message. For now, we assume
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it's continuation data from the middle of a message,
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and just return the remaining length in the tvbuff so
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the rest of the tvbuff is displayed as continuation
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data. */
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return tvb_length_remaining(tvb, offset);
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}
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}
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}
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static int dissect_bencoding_str(tvbuff_t *tvb, packet_info *pinfo _U_,
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int offset, int length, proto_tree *tree, proto_item *ti, int treeadd)
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{
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guint8 ch;
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int stringlen = 0, nextstringlen;
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int used;
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int izero = 0;
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if (length<2) {
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Decode Aborted: Invalid String");
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}
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return -1;
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}
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used = 0;
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while (length>=1) {
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ch = tvb_get_guint8(tvb, offset+used);
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length--;
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used++;
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if (ch==':' && used>1) {
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if (stringlen>length || stringlen<0) {
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Decode Aborted: Invalid String Length");
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}
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return -1;
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}
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if (tree) {
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proto_tree_add_uint(tree, hf_bittorrent_bstr_length, tvb, offset, used, stringlen);
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proto_tree_add_item(tree, hf_bittorrent_bstr, tvb, offset+used, stringlen, FALSE);
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if (treeadd==1) {
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proto_item_append_text(ti, " Key: %s", format_text(ep_tvb_memdup(tvb, offset+used, stringlen), stringlen));
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}
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if (treeadd==2) {
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proto_item_append_text(ti, " Value: %s", format_text(ep_tvb_memdup(tvb, offset+used, stringlen), stringlen));
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}
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}
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return used+stringlen;
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}
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if (!izero && ch>='0' && ch<='9') {
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if (ch=='0' && used==1) {
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izero = 1;
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}
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nextstringlen = (stringlen * 10) + (ch - '0');
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if (nextstringlen>=stringlen) {
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stringlen = nextstringlen;
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continue;
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}
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}
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Decode Aborted: Invalid String");
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}
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return -1;
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}
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Truncated Data");
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}
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return -1;
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}
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static int dissect_bencoding_int(tvbuff_t *tvb, packet_info *pinfo _U_,
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int offset, int length, proto_tree *tree, proto_item *ti, int treeadd)
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{
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gint32 ival=0;
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int neg = 0;
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int izero = 0;
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int used;
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guint8 ch;
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if (length<3) {
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Decode Aborted: Invalid Integer");
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}
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return -1;
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}
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length--;
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used = 1;
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while (length>=1) {
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ch = tvb_get_guint8(tvb, offset+used);
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length--;
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used++;
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switch (ch) {
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case 'e':
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if (tree) {
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if (neg) ival = -ival;
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proto_tree_add_int(tree, hf_bittorrent_bint, tvb, offset, used, ival);
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if (treeadd==2) {
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proto_item_append_text(ti, " Value: %d", ival);
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}
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}
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return used;
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case '-':
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if (used==2) {
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neg = 1;
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break;
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}
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/* Fall through */
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default:
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if (!(ch=='0' && used==3 && neg)) { /* -0 is invalid */
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if (ch=='0' && used==2) { /* as is 0[0-9]+ */
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izero = 1;
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break;
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}
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if (!izero && ch>='0' && ch<='9') {
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ival = (ival * 10) + (ch - '0');
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break;
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}
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}
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Decode Aborted: Invalid Integer");
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}
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return -1;
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}
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}
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if (tree) {
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proto_tree_add_text(tree, tvb, offset, length, "Truncated Data");
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}
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return -1;
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}
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static int dissect_bencoding_rec(tvbuff_t *tvb, packet_info *pinfo _U_,
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int offset, int length, proto_tree *tree, int level, proto_item *treei, int treeadd)
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{
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guint8 op;
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int oplen = 0, op1len, op2len;
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int used;
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proto_item *ti = NULL, *td = NULL;
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proto_tree *itree = NULL, *dtree = NULL;
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if (level>10) {
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proto_tree_add_text(tree, tvb, offset, -1, "Decode Aborted: Nested Too Deep");
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return -1;
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}
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if (length<1) {
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proto_tree_add_text(tree, tvb, offset, -1, "Truncated Data");
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return length;
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}
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op = tvb_get_guint8(tvb, offset);
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if (tree) {
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oplen = dissect_bencoding_rec(tvb, pinfo, offset, length, NULL, level, NULL, 0);
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if (oplen<0) oplen = length;
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}
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switch (op) {
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case 'd':
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if (tree) {
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td = proto_tree_add_item(tree, hf_bittorrent_bdict, tvb, offset, oplen, FALSE);
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dtree = proto_item_add_subtree(td, ett_bittorrent_bdict);
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}
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used = 1;
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length--;
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while (length>=1) {
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op = tvb_get_guint8(tvb, offset+used);
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if (op=='e') {
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return used+1;
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}
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op1len = dissect_bencoding_str(tvb, pinfo, offset+used, length, NULL, NULL, 0);
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if (op1len<0) {
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if (dtree) {
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proto_tree_add_text(dtree, tvb, offset+used, -1, "Decode Aborted: Invalid Dictionary Key");
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}
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return op1len;
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}
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op2len = -1;
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if (length-op1len>2)
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op2len = dissect_bencoding_rec(tvb, pinfo, offset+used+op1len, length-op1len, NULL, level+1, NULL, 0);
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if (op2len<0) {
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if (dtree) {
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proto_tree_add_text(dtree, tvb, offset+used+op1len, -1, "Decode Aborted: Invalid Dictionary Value");
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}
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return op2len;
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}
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if (dtree) {
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ti = proto_tree_add_item(dtree, hf_bittorrent_bdict_entry, tvb, offset+used, op1len+op2len, FALSE);
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itree = proto_item_add_subtree(ti, ett_bittorrent_bdict_entry);
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dissect_bencoding_str(tvb, pinfo, offset+used, length, itree, ti, 1);
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dissect_bencoding_rec(tvb, pinfo, offset+used+op1len, length-op1len, itree, level+1, ti, 2);
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}
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used += op1len+op2len;
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length -= op1len+op2len;
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}
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if (dtree) {
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proto_tree_add_text(dtree, tvb, offset+used, -1, "Truncated Data");
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}
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return -1;
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case 'l':
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if (tree) {
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ti = proto_tree_add_item(tree, hf_bittorrent_blist, tvb, offset, oplen, FALSE);
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itree = proto_item_add_subtree(ti, ett_bittorrent_blist);
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}
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used = 1;
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length--;
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while (length>=1) {
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op = tvb_get_guint8(tvb, offset+used);
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if (op=='e') {
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return used+1;
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}
|
|
|
|
oplen = dissect_bencoding_rec(tvb, pinfo, offset+used, length, itree, level+1, ti, 0);
|
|
if (oplen<1) return oplen;
|
|
|
|
used += oplen;
|
|
length -= oplen;
|
|
}
|
|
if (itree) {
|
|
proto_tree_add_text(itree, tvb, offset+used, -1, "Truncated Data");
|
|
}
|
|
return -1;
|
|
|
|
case 'i':
|
|
return dissect_bencoding_int(tvb, pinfo, offset, length, tree, treei, treeadd);
|
|
|
|
default:
|
|
if (op>='1' && op<='9') {
|
|
return dissect_bencoding_str(tvb, pinfo, offset, length, tree, treei, treeadd);
|
|
}
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(tree, tvb, offset, -1, "Decode Aborted: Invalid Bencoding");
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(tree, tvb, offset, -1, "Decode Aborted: Internal Error");
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void dissect_bencoding(tvbuff_t *tvb, packet_info *pinfo _U_,
|
|
int offset, int length, proto_tree *tree)
|
|
{
|
|
dissect_bencoding_rec(tvb, pinfo, offset, length, tree, 0, NULL, 0);
|
|
}
|
|
|
|
static void dissect_bittorrent_message (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
int i;
|
|
int doffset = BITTORRENT_HEADER_LENGTH;
|
|
int isamp = 0;
|
|
proto_tree *mtree;
|
|
guint16 type = 0;
|
|
guint32 typelen = 0;
|
|
guint8 prio = 0;
|
|
guint32 length;
|
|
const char *msgtype = NULL;
|
|
proto_item *ti;
|
|
guint32 piece_index, piece_begin, piece_length;
|
|
guint32 stringlen;
|
|
|
|
if (tvb_bytes_exist(tvb, offset + BITTORRENT_HEADER_LENGTH, 1)) {
|
|
/* Check for data from the middle of a message. */
|
|
length = tvb_get_ntohl(tvb, offset);
|
|
type = tvb_get_guint8(tvb, offset + BITTORRENT_HEADER_LENGTH);
|
|
|
|
if (type==BITTORRENT_MESSAGE_CHOKE && length>4) {
|
|
/*
|
|
* Choke messages have no payload, so this is likely an Azureus
|
|
* Messaging Protocol packet
|
|
*/
|
|
if (!tvb_bytes_exist(tvb, offset + BITTORRENT_HEADER_LENGTH, 4))
|
|
return;
|
|
|
|
typelen = tvb_get_ntohl(tvb, offset + BITTORRENT_HEADER_LENGTH);
|
|
if (4+typelen+1<=length) {
|
|
if (!tvb_bytes_exist(tvb, offset + BITTORRENT_HEADER_LENGTH + 4, typelen+1))
|
|
return;
|
|
|
|
for ( i=0 ; amp_messages[i].name ; i++ ) {
|
|
if (strlen(amp_messages[i].name)==typelen &&
|
|
tvb_memeql(tvb, offset + BITTORRENT_HEADER_LENGTH + 4,
|
|
amp_messages[i].name, strlen(amp_messages[i].name))==0) {
|
|
|
|
prio = tvb_get_guint8(tvb, offset + BITTORRENT_HEADER_LENGTH + 4 + typelen);
|
|
if (prio==0 || prio==1 || prio==2) {
|
|
type = amp_messages[i].value;
|
|
doffset = BITTORRENT_HEADER_LENGTH + 4 + typelen + 1;
|
|
isamp = 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
msgtype = match_strval(type, bittorrent_messages);
|
|
/* if (msgtype == NULL && isamp) {
|
|
msgtype = match_strval(type, azureus_messages);
|
|
} */
|
|
if (msgtype == NULL) {
|
|
proto_tree_add_text(tree, tvb, offset, -1, "Continuation data");
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Continuation data");
|
|
}
|
|
return;
|
|
}
|
|
} else {
|
|
/* not enough bytes of the header, stop here */
|
|
return;
|
|
}
|
|
|
|
if (isamp) {
|
|
ti = proto_tree_add_item(tree, hf_azureus_msg, tvb, offset, length + BITTORRENT_HEADER_LENGTH, FALSE);
|
|
} else {
|
|
ti = proto_tree_add_item(tree, hf_bittorrent_msg, tvb, offset, length + BITTORRENT_HEADER_LENGTH, FALSE);
|
|
}
|
|
mtree = proto_item_add_subtree(ti, ett_bittorrent_msg);
|
|
|
|
/* Keepalive message */
|
|
if (length == 0) {
|
|
proto_tree_add_item(mtree, hf_bittorrent_msg_len, tvb, offset, BITTORRENT_HEADER_LENGTH, FALSE);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "KeepAlive");
|
|
}
|
|
return;
|
|
}
|
|
|
|
proto_tree_add_item(mtree, hf_bittorrent_msg_len, tvb, offset, BITTORRENT_HEADER_LENGTH, FALSE);
|
|
offset += BITTORRENT_HEADER_LENGTH;
|
|
|
|
/* If the tvb_bytes_exist() call above returned FALSE, this will
|
|
throw an exception, so we won't use msgtype or type. */
|
|
if (isamp) {
|
|
proto_tree_add_item(mtree, hf_azureus_msg_type_len, tvb, offset, 4, FALSE);
|
|
proto_tree_add_item(mtree, hf_azureus_msg_type, tvb, offset+4, typelen, FALSE);
|
|
proto_item_append_text(ti, ": Len %u, %s", length, msgtype);
|
|
proto_tree_add_item(mtree, hf_azureus_msg_prio, tvb, offset+4+typelen, 1, FALSE);
|
|
offset += 4+typelen+1;
|
|
length -= 4+typelen+1;
|
|
} else {
|
|
proto_tree_add_item(mtree, hf_bittorrent_msg_type, tvb, offset, 1, FALSE);
|
|
proto_item_append_text(ti, ": Len:%u, %s", length, msgtype);
|
|
offset += 1;
|
|
length -= 1;
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, msgtype);
|
|
}
|
|
|
|
switch (type) {
|
|
case BITTORRENT_MESSAGE_CHOKE:
|
|
case BITTORRENT_MESSAGE_UNCHOKE:
|
|
case BITTORRENT_MESSAGE_INTERESTED:
|
|
case BITTORRENT_MESSAGE_NOT_INTERESTED:
|
|
/* No payload */
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_REQUEST:
|
|
case BITTORRENT_MESSAGE_CANCEL:
|
|
piece_index = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_index, tvb, offset, 4, piece_index); offset += 4;
|
|
piece_begin = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_begin, tvb, offset, 4, piece_begin); offset += 4;
|
|
piece_length = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_length, tvb, offset, 4, piece_length);
|
|
proto_item_append_text(ti, ", Piece (Idx:0x%x,Begin:0x%x,Len:0x%x)", piece_index, piece_begin, piece_length);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Piece (Idx:0x%x,Begin:0x%x,Len:0x%x)", piece_index, piece_begin, piece_length);
|
|
}
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_HAVE:
|
|
piece_index = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(mtree, hf_bittorrent_piece_index, tvb, offset, 4, FALSE);
|
|
proto_item_append_text(ti, ", Piece (Idx:0x%x)", piece_index);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Piece (Idx:0x%x)", piece_index);
|
|
}
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_BITFIELD:
|
|
proto_tree_add_item(mtree, hf_bittorrent_bitfield_data, tvb, offset, length, FALSE);
|
|
proto_item_append_text(ti, ", Len:0x%x", length);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Len:0x%x", length);
|
|
}
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_PIECE:
|
|
piece_index = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_index, tvb, offset, 4, piece_index);
|
|
offset += 4;
|
|
length -= 4;
|
|
piece_begin = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(mtree, hf_bittorrent_piece_begin, tvb, offset, 4, piece_begin);
|
|
offset += 4;
|
|
length -= 4;
|
|
proto_tree_add_item(mtree, hf_bittorrent_piece_data, tvb, offset, length, FALSE);
|
|
proto_item_append_text(ti, ", Idx:0x%x,Begin:0x%x,Len:0x%x", piece_index, piece_begin, length);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Idx:0x%x,Begin:0x%x,Len:0x%x", piece_index, piece_begin, length);
|
|
}
|
|
break;
|
|
|
|
case AZUREUS_MESSAGE_HANDSHAKE:
|
|
case AZUREUS_MESSAGE_PEER_EXCHANGE:
|
|
dissect_bencoding(tvb, pinfo, offset, length, mtree);
|
|
break;
|
|
|
|
case AZUREUS_MESSAGE_JPC_HELLO:
|
|
stringlen = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_addrlen, tvb, offset, 4, FALSE);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_addr, tvb, offset+4, stringlen, FALSE);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_port, tvb, offset+4+stringlen, 4, FALSE);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_session, tvb, offset+4+stringlen+4, 4, FALSE);
|
|
break;
|
|
|
|
case AZUREUS_MESSAGE_JPC_REPLY:
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_session, tvb, offset, 4, FALSE);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_bittorrent_welcome (tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
int i;
|
|
char *version;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Handshake");
|
|
}
|
|
|
|
proto_tree_add_item(tree, hf_bittorrent_prot_name_len, tvb, offset, 1, FALSE); offset+=1;
|
|
proto_tree_add_item(tree, hf_bittorrent_prot_name, tvb, offset, 19, FALSE); offset += 19;
|
|
proto_tree_add_item(tree, hf_bittorrent_reserved, tvb, offset, 8, FALSE); offset += 8;
|
|
|
|
proto_tree_add_item(tree, hf_bittorrent_sha1_hash, tvb, offset, 20, FALSE);
|
|
offset += 20;
|
|
|
|
proto_tree_add_item(tree, hf_bittorrent_peer_id, tvb, offset, 20, FALSE);
|
|
if(decode_client_information) {
|
|
for(i = 0; peer_id[i].id[0] != '\0'; ++i)
|
|
{
|
|
if(tvb_memeql(tvb, offset, peer_id[i].id, strlen(peer_id[i].id)) == 0) {
|
|
/* The version number is 4 numeric characters for the
|
|
client ids beginning with '-' and 3 characters for the
|
|
rest. */
|
|
version = tvb_get_ephemeral_string(tvb, offset + strlen(peer_id[i].id),
|
|
(peer_id[i].id[0] == '-') ? 4 : 3);
|
|
proto_tree_add_text(tree, tvb, offset, 20, "Client is %s v%s",
|
|
peer_id[i].name,
|
|
format_text((guchar*)version, (peer_id[i].id[0] == '-') ? 4 : 3));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
offset += 20;
|
|
}
|
|
|
|
static void dissect_bittorrent_tcp_pdu (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *ti;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BitTorrent");
|
|
}
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "BitTorrent ");
|
|
}
|
|
|
|
ti = proto_tree_add_item (tree, proto_bittorrent, tvb, 0, -1, FALSE);
|
|
tree = proto_item_add_subtree(ti, ett_bittorrent);
|
|
|
|
if (tvb_get_guint8(tvb, 0) == 19 &&
|
|
tvb_memeql(tvb, 1, "BitTorrent protocol", 19) == 0) {
|
|
dissect_bittorrent_welcome(tvb, pinfo, tree);
|
|
} else {
|
|
dissect_bittorrent_message(tvb, pinfo, tree);
|
|
}
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_str(pinfo->cinfo, COL_INFO, " ");
|
|
col_set_fence(pinfo->cinfo, COL_INFO);
|
|
}
|
|
}
|
|
|
|
static void dissect_bittorrent (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
tcp_dissect_pdus(tvb, pinfo, tree, bittorrent_desegment, BITTORRENT_HEADER_LENGTH,
|
|
get_bittorrent_pdu_length, dissect_bittorrent_tcp_pdu);
|
|
}
|
|
|
|
static gboolean test_bittorrent_packet (tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
conversation_t *conversation;
|
|
|
|
if (tvb_bytes_exist(tvb, 0, 20) &&
|
|
tvb_get_guint8(tvb, 0) == 19 &&
|
|
tvb_memeql(tvb, 1, "BitTorrent protocol", 19) == 0) {
|
|
conversation = conversation_new (pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
|
|
|
|
conversation_set_dissector(conversation, dissector_handle);
|
|
|
|
dissect_bittorrent(tvb, pinfo, tree);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
proto_register_bittorrent(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_bittorrent_field_length,
|
|
{ "Field Length", "bittorrent.length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_prot_name_len,
|
|
{ "Protocol Name Length", "bittorrent.protocol.name.length", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_prot_name,
|
|
{ "Protocol Name", "bittorrent.protocol.name", FT_STRING, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_reserved,
|
|
{ "Reserved Extension Bytes", "bittorrent.reserved", FT_BYTES, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_sha1_hash,
|
|
{ "SHA1 Hash of info dictionary", "bittorrent.info_hash", FT_BYTES, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_peer_id,
|
|
{ "Peer ID", "bittorrent.peer_id", FT_BYTES, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_msg,
|
|
{ "Message", "bittorrent.msg", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_msg_len,
|
|
{ "Message Length", "bittorrent.msg.length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_msg_type,
|
|
{ "Message Type", "bittorrent.msg.type", FT_UINT8, BASE_DEC, VALS(bittorrent_messages), 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_msg,
|
|
{ "Azureus Message", "bittorrent.azureus_msg", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_msg_type_len,
|
|
{ "Message Type Length", "bittorrent.msg.typelen", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_msg_type,
|
|
{ "Message Type", "bittorrent.msg.aztype", FT_STRING, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_msg_prio,
|
|
{ "Message Priority", "bittorrent.msg.prio", FT_UINT8, BASE_DEC, VALS(azureus_priorities), 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_bitfield_data,
|
|
{ "Bitfield data", "bittorrent.msg.bitfield", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_index,
|
|
{ "Piece index", "bittorrent.piece.index", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_begin,
|
|
{ "Begin offset of piece", "bittorrent.piece.begin", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_data,
|
|
{ "Data in a piece", "bittorrent.piece.data", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_length,
|
|
{ "Piece Length", "bittorrent.piece.length", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_bstr_length,
|
|
{ "String Length", "bittorrent.bstr.length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_bstr,
|
|
{ "String", "bittorrent.bstr", FT_STRING, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_bint,
|
|
{ "Integer", "bittorrent.bint", FT_INT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_bdict,
|
|
{ "Dictionary", "bittorrent.bdict", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_bdict_entry,
|
|
{ "Entry", "bittorrent.bdict.entry", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_bittorrent_blist,
|
|
{ "List", "bittorrent.blist", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_addrlen,
|
|
{ "Cache Address Length", "bittorrent.jpc.addr.length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_addr,
|
|
{ "Cache Address", "bittorrent.jpc.addr", FT_STRING, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_port,
|
|
{ "Port", "bittorrent.jpc.port", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_session,
|
|
{ "Session ID", "bittorrent.jpc.session", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }
|
|
}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_bittorrent,
|
|
&ett_bittorrent_msg,
|
|
&ett_peer_id,
|
|
&ett_bittorrent_bdict,
|
|
&ett_bittorrent_bdict_entry,
|
|
&ett_bittorrent_blist
|
|
};
|
|
|
|
module_t *bittorrent_module;
|
|
|
|
proto_bittorrent = proto_register_protocol("BitTorrent", "BitTorrent", "bittorrent");
|
|
proto_register_field_array(proto_bittorrent, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("bittorrent.tcp", dissect_bittorrent, proto_bittorrent);
|
|
|
|
bittorrent_module = prefs_register_protocol(proto_bittorrent, NULL);
|
|
prefs_register_bool_preference(bittorrent_module, "desegment",
|
|
"Reassemble BitTorrent messages spanning multiple TCP segments",
|
|
"Whether the BitTorrent dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&bittorrent_desegment);
|
|
prefs_register_bool_preference(bittorrent_module, "decode_client",
|
|
"Decode the peer_id of the handshake messages",
|
|
"Enabling this will tell which BitTorrent client that produced the handshake message",
|
|
&decode_client_information);
|
|
}
|
|
|
|
|
|
void
|
|
proto_reg_handoff_bittorrent(void)
|
|
{
|
|
/* dissector_handle = create_dissector_handle(dissect_bittorrent, proto_bittorrent); */
|
|
dissector_handle = find_dissector("bittorrent.tcp");
|
|
#if 0
|
|
dissector_add("tcp.port", 6881, dissector_handle);
|
|
dissector_add("tcp.port", 6882, dissector_handle);
|
|
dissector_add("tcp.port", 6883, dissector_handle);
|
|
dissector_add("tcp.port", 6884, dissector_handle);
|
|
dissector_add("tcp.port", 6885, dissector_handle);
|
|
dissector_add("tcp.port", 6886, dissector_handle);
|
|
dissector_add("tcp.port", 6887, dissector_handle);
|
|
dissector_add("tcp.port", 6888, dissector_handle);
|
|
dissector_add("tcp.port", 6889, dissector_handle);
|
|
#endif
|
|
heur_dissector_add("tcp", test_bittorrent_packet, proto_bittorrent);
|
|
}
|